Bore gauge



BORE GAUGE Filed July 25, 1939 v 2- Shets-Sheet 1 I2 e l2 e f 32 s2 `llllvf 11 2 1' I Y e @Me/4221,. B5

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v INVENTOR Mull May 6, 1941. v s. wEs'rcoTT BORE GAUGE Filed July 25. 1939 2 Sheets-Shes?l 2 T .5 w m 5. s w w m I .Il

Patentedl May. 6, 1.941

UNITI-:D STATES,I PATENroFFl-ce l GE 'l i n vuoi-us s. Westcott. Pawtucket n. I.,

Jenckes Knitting" Machine Co tncket, E. I., a corporation of Rhode Island Application July 25,' 1939, Serial No. 286,467

My invention relates to measuring gauges for checking bores for size, taper and other 4types of structural defects, and has among its objects and 'advantages the provision' of an improved measuring unit adapted for association with c'on- 5 ventional dial indicators with any type or scale oi graduations, in which the'v construction is such as" to provide an accurate reading as well as measurements of the bore at-th'e bottom thereof.

4In the accompanying drawings: 1

Figure 1 is a sectional view along the line I-'I of Figure 3, with certain ffparts illustrated in elevation;

Figure 2 is a oP-Fi`gure 3, with elevation; v

Figure 3 is an elevational view illustrating the detector head in association with a conventionaldial indicator, with the head connected with the indicator by a tubular connection to permit the 20 head to be lowered to the bottom of a bore and at the same time maintaining the indicator visible;

Figure 4 is a sectional view of a diierent form of head; and

Figure 5 is a sectional viewv of the head of Fig. 4 illustrating the head in associationwith theV dial indicator of Figs. 2 and 3.

In the embodiment selectedV to illustrate my invention, I make use of a head 5 provided with a central bore 21 for the reception of a sleeve I3 boredto slidably receive a measuring stud I2 having a ilange 29 arranged in engagement with the rounded end of a finger 30 of an actuating member II mounted for rotation about the pin 25. Member II includes a second finger 3i having a rounded end engaging one end of a sliding plunger I8 for operating the dial; mechanism of the indicator in the usual way. Measuring stud I2 is rounded at its outer end. Sleeve I3 is sectional f'view along the line 2-2 certain parts illustrated in 15 -grooved at 32 for the reception of a set screw 24 which secures the sleeve against ,relative axial movement relatively to the bore 2li.

Projecting a short distance inside the opposite end of the Ybore 2l is a sleeve 26 internally threaded for threaded connection with a screw I6, and the sleeve is made secure by a set screw 23 threaded into the head 5 with the inner end of the set screw extending into the circumferential groove 32. Screw I6 is internally threaded for connection with a threaded pin 23 having a stud I4 rounded at its outer end. Stud I4 is axially aligned with the measuring'stud I2, the latter being movable longitudinally oi the sleeve I3, but the screw I6 is stationary after being set.

z claims. (ci. .z3-11s) Screw I6 may be adjusted to provide a predetermined spacing between the studs I2 andI I4 andmade secure through the medium of a set screw 22 having its inner end extending' through an opening 'in the sleeve 2B.

`Head 5 is bored at. for the reception of bushings 'l which slidably support locating studs 6 positioned on diametrically opposite sides of the measuring stud I2, with theaxis of the meas- 0 uring stud lying in a plane passing through the axes of the locating studs 6. Locating studs 6 extend through bores in the head 5 and are flanged at 36 to provide abutments for compression springs 8 which have their opposite ends resting on the bottoms 31 of bores I8 of suilicient diameter to loosely receive the flanges 36. A plate 9 is -provided with right-angular runs 39 slidable in grooves 40 in the head 5. Plate 9 is provided with a bore 4I for loosely receiving the sleeve 26, and the compression springs 8^ press the ilanges 3l of the locating studs t against the plate. A plate lilies against one end of the head 5 and is provided with rightangular arms I2 ilxedly secured to the head by screws 43. Plate II is provided with a bore Se for supporting one end oi' the sleeve 26. Between the plates 9 and I I, I position strong compression springs III which normally urge the plate 9 and the locating studs 6 to the positions of Figure l. l

In operation, the screw I6 may be adjusted to precisely position the ends of the measuring studs I2 and Il at the required distance. The screw I6 is adjusted while observing the needle 2i of the gauge and when the spacing is attained, with the needle in proper registration. the screw I6 is made secure by the set screw 22. In the event that the adjustable range of the screw I6 is insuiilcient for adjusting the measuring unit to large diameter bores, a measuring stud Il of greater length may be substituted for the one illustrated in Figure 2, thus permitting the measuring device to function in connection with a large range of diameters through mere substitution of the measuring stud It.

When the head 5 is positioned in a bore to be measured, locating pins B will engage the wall of the bore and cooperate with the stud I4 for precisely locating the measuring unit at the true diametrical center of the bore. measuring stud I2 is then brought into play and will move inwardly or outwardly, depending upon structural irregularities in the bore, for actuating the member il, which in turn actuates the plunger I8 operatively connected with The sliding the needle 2i to indicate the degree of 'structural irregularity in terms of whatever scale of gradubore of considerable depth so that the indicator' 2li will be visible while taking measinements in relatively deep bores. While the locating studs l may move in unison, the studs are structurally independent with respect to the plate I which eliminates binding incident to measuring devices in which the locating studs are integrally connected. Thus, the measuring unit functions so as toprovide precise location of the unitinside the bore to the end that accurate readings may be had to determine the exact condition of the bore.

Figs. 4 and illustrate a slightly different form of construction in which the locating studs 6 are provided with right-angular plate elements 45 having ends I6 curved concentrically'about the axis of the sliding measuring stud I2; Studs 6 are provided with transverse slots 41 through which pins I8 extend, which pins are carried by screws 48 threaded into the body 5.

The body is provided with bores 50 for the reception of compression springs 5i, andthe springs each has one end abutting one of the studs I and its other end abutting a screw plug 52 having .threaded rel-ation with its respective bore SII. Bores l0 are also provided with bushings 1 i'or the studs 8. In other respects, the construction of Figs. 4 and 5 is similar to that illustrated in Figs. 1, 2 and 3. Studs t operate against strong compression springs so as to eliminate the plate i illustrated in Figs. 1 and 2.

Having thus described certain embodiments of my invention in detail, it is, of course, understood that I do not desire to limit the scope thereof to the exact details set forth except in so far as those details may be defined in the appended claims.

I claim:

y 1. In a bore measuringV device including a dial indicator mechanism actuating plunger, a head provided with grooves and bores. locating studs slldable in said bores, a plate having right angular bars slidably disposed in said grooves, with each of the locating studs independently springpressed against said plate,'springs exerting pressure on said plato for holding the latter in engagement with said locating studs against the tension of the forces of the spring-pressed studs, a normally iixed measuring stud carriedby said head, a slidable measuring stud axially aligned.Il

with said' fixed measuring stud, and an operating connection between said slidable measuring stud and said actuating plunger. v

2. In a bore measuring device including a dial indicator mechanism actuating plunger, a head provided with grooves and lbores, locating studs slidable in said` bores, a plate having right angular bars slidably disposed in said grooves, with each of the locating studs independently spring` pressed against said plate, springs exerting pressure on said plate for holding the latter in engagement with 'said locating studs against the.

tension of the forces of the spring-pressed studs, a normally xed measuring stud carried hy said head, a slidable measuring stud axially aligned with said fixed measuring stud, and an operating connectionfbetween said slidable measuring stud and saidactuating plunger, and an abutment platel attached to said head for holding said springs against said plate.

VALORUS, S. WESTCOI'I. 

